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Vikram Singh. Naingwin Aung. Show More. Views Total views. Actions Shares. No notes for slide. Selection of pump 1. Type of fluid: chemical and physical characteristics of the fluid to be pumped. System-head curve: may be obtained from the manufacturer. Potential system modifications 4.
Operational mode: degree of flow, head fluctuation, and mode of operation continuous or intermittent 5. Pumping System - continued 6. Pump selection: based on the fluid characteristics, turn-down ratio, discharge pressure and system requirements, availability of space, lay-out, energy and pump costs, code requirements, and the materials used in the construction.
Drive selection: electric motor, internal combustion engine, or steam; constant or variable speed drives; the majority of pumps are driven by squirrel-cage induction motors due to their versatility and availability Synchronous: requiring large horse power Wound rotor: requiring variable speed drives Reduced voltage starting and low in-rush current 3 4.
Pumping System - continued 8. Special Considerations 1. Pump starting conditions Centrifugal pumps: close the discharge valve during startup to prevent hydraulic surges.
Propeller type pumps: require very high horse power at start-up. Hydraulic surge control During pump start-up: install a surge control valve Water hammer: install a surge tank 6 7. Special Considerations - continued 4. Design of the pump suction well The pump impeller requires a particular type of flow condition to exist. Types of Pressure Gage pressure is usually the one we mean when we talk about pump pressure in pounds per square inch P.
Head vs. Pressure The figure are to illustrate the relationship between head and pressure with a centrifugal pump handling liquids of varying specific gravity 10 Pressure - continued Three identical pump, each designed to develop Pressure - continued Three pumps designed for same pressure will develop heads ft.
Fluid flow Friction loss — Water Friction loss for water in ft per ft of pipe Fluid flow Friction loss — Water Resistance coefficients for valves and fittings Handle same way as a pipe loss. Values found in hydraulic handbooks. Usually a small value and can be neglected except for very accurate calculations. For duty point of GPM 98 ft. Over calculate pump head requirement 1 Higher driver H.
These values can be determined from the pump specification and the pump curve. Pump effluent liquid is ethylene glycol at Sp. NPSHA 2. Refer to following pages for example calculations. The spreadsheet below represents the basic 16 week cycle. If you want to really take your training to the next level, check out excellent literature below from Chad Wesley Smith.
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